<template>
<div>
  <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
         <el-row>
             <el-col>
        <!-- 添加角色按钮区域-->
        <el-button type="primary">添加角色</el-button>
            </el-col>
         </el-row>

             <!-- 角色列表区域-->
             <el-table :data="rolelist" border stripe>
                 <!-- 展开列 -->
                 <el-table-column type="expand">
                     <template slot-scope="scope">
                        <el-row :class="['bdbottom',i1 === 0? 'bdtop':'','vcenter']" v-for="(item1,i1) in scope.row.children"
                        :key="item1.id">
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                             <!-- 渲染二级和三级权限 -->
                            <el-col :span="19">
                                <!-- 通过for循环 嵌套渲染二级权限-->
                                <el-row :class="['bdtop',i2 === 0? '':'bdtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                                    <el-col :span="6">
                                        <el-tag type="success" closable 
                                        @close="removeRightById(scope.row,item2.id)">
                                        {{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <el-col :span="18">
                                        <el-tag type="warning" v-for="(item3) in item2.children"
                                        :key="item3.id" closable @click="removeRightById(scope.row,item3.id)">
                                            {{item3.authName}}
                                        </el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                     </template>
                 </el-table-column>
                 <!-- 索引列 -->
                 <el-table-column type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="300px">
                <template>
                    <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                    <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                    <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog
                    (scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
             </el-table>
    </el-card>

    <!-- 分配权限的对话框-->
    <el-dialog title="分配权限" :visible.sync="setRightDialogVisible"
  width="50%" @close="setRightDialogClosed">
  <!-- 树形控件-->
  <el-tree :data="rightslist" :props="treeProps" show-checkbox 
    node-key="id" default-expand-all 
    :default-checked-keys="defkeys" ref="treeRef"></el-tree>
  <span slot="footer" class="dialog-footer">
    <el-button @click="setRightDialogVisible = false">取 消</el-button>
    <el-button type="primary" 
     @click="allotRights">确 定</el-button>
  </span>
</el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            //所有角色列表数据
            rolelist:[],
            //控制分配权限对话框的显示与隐藏
            setRightDialogVisible:false,
            //所有权限的数据
            rightslist:[],
            //树形控件的属性绑定对象
            treeProps:{
                label:'authName',//显示的文本
                children:'children'//嵌套
            },
            //默认选中的节点Id值数组
            defkeys:[],
            //当前即将分配权限的id
            roleId:''
        }
    },
    created(){
        this.getRolesList()
    },
    methods:{
        //获取所有角色的列表
        //简化异步网络请求
         async getRolesList(){
          const {data:res} = await this.$http.get('roles')  
        if(res.meta.status !== 200){
            return this.$message({
                message: '获取角色列表失败！',
                type: 'error',
                duration: 1000
                            })
            //把获取的数据赋给 rolelist
            this.rolelist = res.data
            console.log(this.rolelist)
        }
        },
        //根据id删除对应的权限
       async removeRightById(role,rightId){
            //弹框提示用户是否要删除
           const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
        }).catch(err => err)
        if(confirmResult !== 'confirm'){
            return this.$message.info('取消了删除！')
        }

       const {data:res} = await this.$http.delete
       (`roles/${role.id}/rights/${rightId}`)

         if(res.meta.status !== 200){
            return this.$message({
                message: '删除权限失败！',
                type: 'error',
                duration: 1000
                            })
        }
            role.children = res.data
        },
        //展示分配权限的对话框
        async showSetRightDialog(role){
            this.roleId = role.id
            //获取所有权限的数据
            const {data:res}= await this.$http.get('right/tree')
            
            if(res.meta.status !== 200){
                return this.$message({
                message: '删除权限数据失败！',
                type: 'error',
                duration: 1000
                            })
            }
            //把获取到的权限数据保存到 data 中
            this.rightslist = res.data

            //获取三级节点的id
            this.getLeafKeys(role,this.defkeys)
            this.setRightDialogVisible = true
        },
        //通过递归的形式，获取角色下所有三级权限的id,
        //并保存到 defKeys数组中
        getLeafKeys(node,arr){
            //如果当前 node 节点不包含 children 属性，
            //则是三级节点
            if(!node.children){
                return arr.push(node.id)
            }

            node.children.forEach(item => 
                this.getLeafKeys(item,arr));
        },
        //监听分配权限对话框的关闭事件
        setRightDialogClosed(){
            this.defkeys = []
        },
        //点击为角色分配权限
        async allotRights(){
            const keys = [
                //展开运算符
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ]

            const idStr = keys.join(',')
            const {data:res} = await this.$http.post(`roles/
            ${this.roleId}/rights`,
                {rids:idStr})

                if(res.meta.status !== 200){
                    return this.$message({
                message: '分配权限失败！',
                type: 'error',
                duration: 1000
                            })
                }
                this.$message.success('分配权限成功')
                this.getRolesList()
                this.setRightDialogVisible = false
        }
    }
};
</script>

<style lang="less" scoped>
.el-tag{
    margin: 7px;
}

.bdtop{
    border-top: 1px solid #eeeeee;
}

.bdbottom{
    border-bottom: 1px solid #eeeeee;
}

.vcenter{
    display: flex;
    align-items: center;
}
</style>
